The following web site is a link to where things are in the overworlds in the 4th Quest entries.
http://l.j-factor.com/zeldaclassic/fourth/overworlds.html#
I know there were quests submitted by QuestWizard, Sylph, CaRmAgE, crow22, Phoenix, and AmazingAmpharos. They must be available somewhere because someone has posted a video walkthrough of Sylph's quest on YouTube, so my question is this: Besides the 4th quest that comes with ZC, are the other 4th quest entries available anywhere for playing?